Improvement in drill-cylinders



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ittica* @da CHARLES S. PATTISON, OF NORTH ADAMS, ASSIGNOR TO BURLEIGHROCK- DRILL COMPANY, OF FITCHBURG, MASSACHUSETTS.

Letters Patent No. 114.193, dated April 25, 1871.

IMPROVEMENT IN DRILL-CYLINDERS.

The Schedule referred to in these Letters Patent and making part of thelame.

To all whom it 'may concern:

Be it known that I, CHARLES S. PATtrIsoN, of North Adams, in the countyof Berkshire and State of Massachusetts, have invented an Improvement iuDrillCylinders; and I do hereby declare that the following, takeu inconnection with the drawing which accompanies and forms part of thisspecification, is a description of' my invention sucient to enable thoseskilled in the art to practice it.

In the construction ofthe cylinders of rock-drilling engines of thatclass, instances of which are shown in United States patents Nos. 59,960and and which are particularly well known as Burleigh rockdrills, it hasbeen customary (until my invention) to bolt or screw the upper and lowercylinder-heads to flanges at the adjacent ends of the cylinder, andunder the unavoidable occasional blows of the pistonagainst the lowerhead breakage occurs, the strain upon the head rupturing the cylinderback of the flange, or somewhere between the opposite heads, of courseruining the cylinder.

These breakages have been so constant as to seriously delay progress in.important rock-drilling operations where these drills,have been in use,and have detracted in a very great measure from the practical utilityofthe drills.

The cylinders are cast-iron, and in my improvement I re-enforce thecylinder by means of wrought-iron straps, ties, or rods, or encompassing jackets, by means of which the strain is transferred from thecast or granulated metal to the wrought or fibrous metal; and

My nventionconsists in a drilling-engine cylinder, the lower head ofwhich is united or held to the body by means of wrought-iron rods,straps, or other wrought-.metal connections.

The drawing represents a drilling-engine cylinder embodying myinvention.

A shows a plan of the cylinder;

B is au end view of it;

C, a side elevation of it;

a denotes the cylinder;

b c, the end ilauges thereof;

d, the lower cylinder-head; and

e, the upper cylinder-head.

From the head e to the head d I extend wrought-- iron rods g, havingheads at one end and screw-threads at their opposite ends, withtightening-nuts h, so that the two ends of the cylinder are directlybolted together, and the strain is spentupon these rods instead of Vuponthe cylinder.

Instead of extending these rods from head to head, however, they mayextend from wrought-iron strapplates t' fi. through the flange b andhead d, the straps being bolted to the cylinder by b olts lt or thiswrought-iron strap may be an encompassing or partially encompassingwrought-iron ring or. cylinder, bolted at its front end t0 the head d,and at its opposite end or at its sides to the head e or flange c, or toa ange ortlanges ou the sides of the cylinder` Thus strengthened orre-enforced, no rupture ofthe cylinder ever occurs or can occur, as thestrain is spent upon the wrought-metal bands, ties, or straps.

The blow ofthe piston against the head occurs when the drill-point failsto strike the rock, the piston-rod then driving forward until the pistonbrings` up against the head.

I claim- In a cylinder, in which works the piston of a drillcarryingpist0n-rod, the re-enforcing connections, substantially as shown anddescribed.

Executed December 26, A. D. 1870.

CHARLES S. PATTISON.

Witnesses:

WM. P. PORTER, Unas. N. VAN DE MARK.

